Is that all with the same band?! Soulds like U guys have a wicked mix.

I'm in almost the same situation as you in as my band play loads of varied original stuff from Jazz/Funk to reggae to rock.

I was looking at the Trace-Elliot Combos - the sound is not exactly that of a David eden (sweet amps!) but for the money (at least in the UK) they ar fairly good value. Make sure you shop around though - There are plenty of Music shops with "Gold-digger" salesmen!!

You can't go wrong with a good 4x10 for versatility.Plus a 4x10 will allow you to move up to bigger venues than 100-150 ( medium size club). I'm not a big fan of 1x15 when used alone.Its great with a 2x10 though.In a medium size club a good 2x10 would be very adequate and you could add another cabinet(like a 1x15) later.
As for combo vs head/cab I definitely vote for the head/cab.There are some very fine combos out there but your flexibility is seriously limited.
Given the information you gave (emphasis on the cheap part) I would try to find a good used 300 watt head and good used 2x10 cab and build from there.That will get you through the medium size club gigs with no difficulty.
Good luck.

I will probably get slammed for this but here goes anyway, there are plenty of old Peavey Mark series heads around and will serve you well as what i call "getter-by amp".You can find them under 300 bucks easily.As for a cab, 15" cabs do not sound good alone so you cant go wrong with a good 410.

I have little to no experience with these but i think a 1X15 & a 2X10 [SWR,Eden which ever you can afford] should do the trick or a SWR Triad with the 1X15 1X10 & horn. Make sure you get @ least 150watts if you're gonna be playing for that many people [a watt for every person]. that's all